Energy Review

PE

100

What is potential energy 

stored energy due to height or position 

200

What is the most common type of potential energy ?

gravitational potential energy 

300

What is the acceleration due to gravity ( g?) 

9.8 m/s

400

There is a bell at the top of a tower that is 95m high. The bell weighs 190kg.

The bell has ___________________ energy. Calculate it.

176,890J

500

The potential energy of an apple is 6.0 joules. The apple is 3m high. What is

the mass of the apple?

.204kg

KE

100

What is kinetic energy?

Energy in motion

200

• If you double mass, you will
  ________kinetic energy. But if you double speed you________the kinetic energy 

double, quadruple 

300

Explain the relationship between pe and ke in a roller coaster

loses pe down the hill and gains pe going up

400

You serve a volley ball with a mass of 4.1kg. The ball leaves your hand at

30m/s. The ball has __________________ energy. Calculate it.

1,845J

500

What is the velocity of a 500kg elevator that has 4000J of energy?

5m/s

Forms of energy

100

an example of this is the sun

radiant(light) energy

200

moving particles generates this

electricity 

300

the breaking of bonds is an example of this type of energy

chemical 

400

Generates heat

thermal

500

what is mechanical energy

pe and ke combined to do work 

Energy transfer

100

Name something that converts electricity to light energy

light bulb, projector etc

200

Name something that converts light to heat

hair dryer

electric blanket

300

• Our bodies convert _____energy in our food into ________energy for us to move.

chemical, kinetic

400

An electric fan transforms electrical energy into _______

kinetic

500

Lightning converts electrical energy into _____, _______ and ______energy

light, heat, sound

Energy Conservation

100

what is the law of conservation of energy 

“Energy can neither.
be created nor destroyed, just converted from
one form into another.”

200

give an example of an energy conversion 

answer varies 

300

explain now renewable energy is better for energy conservation 

_{Renewable energy sources – which are available in abundance all around us, provided by the sun, wind, water, waste, and heat from the Earth – are replenished by nature and emit little to no greenhouse gases or pollutants into the air.}

400

If the energy that exists is always the same, why do people want to conserve it 

limited energy, large increasing poplation

500

list some examples of renewable energy

hydro, wind, solar